Dial for radio receiving sets



Dec. 24, I929. E. B. NOWOSIELSKI 39 DIAL FOR RADIO RECEIVING SETS Filed April 12. 1928 A TTOR/VEY Patented Dec. 24, 1929 UNITED STATES PATENT OFFICE EDWARD B. NOWOSIELSKI, OF BLOOMFIELD, NEW JERSEY, ASSIGNOR T SPLI'IDORF ELECTRICAL COMPANY, OF NEW'ARK, NEW JERSEY DIAL FOR RADIO Application filed April 12,

This invention relates to improvements in dials for radio receiving sets, and their method of attachment to the apparatus to be controlled by said dial, and its associated parts. This application is a continuation in greater part of my application Serial No.' 87,535, filed February 11, 1926.

It is one of the objects of my invention to provide a dial mechanism which is particularly adapted for use in connection with tuning apparatus used in a radio receiving set.

' Another object of my invention is to provide a dial mechanism which is easily adjusted and which will give close adjustment of the tuning apparatus with which it is associated, and at the same time indicate such adjustment.

Another object of my invention is to provide a dial in which provision is made for indicating the sending stations with which radio communication is desired.

Another object of my invention is to provide a dial mechanism which in addition to being useful is also ornamental in character.

These and other objects will be apparent to one skilled in this art, after a study of the specification taken in connection with the annexed drawing, wherein:

Figure 1, is a plan view looking at the front of the dial.

Figure 2, is a view of the dial of Figure 1, turned over.

Figure 3, is a vertical sectional view through Figure 1, showing in addition the mounting panel and a fragmentary portion of a variable condenser to which the dial mechanism may be attached.

Figure 4, is a View of part of the mechanism shown in Figure 2, but showing an adjustment in one of the members whereby variation in reduction of motion of the dial is obtained. I

In the drawing, 1 is a panel board to which tuning apparatus such as the condenser 2,

only a fragmentary portion. of which is shown, may be attached. The rotating element of the condenser is provided with an operating shaft 3. The 'dial comprises a member 4, which may be made of metal either RECEIVING SETS 1928. Serial No. 269,334.

punched or in the form of a die casting, or it may be of moulding insulating material, and is so shown in the drawing, Figure 3. The member 4 is provided with a hub 5, and a rearwardly extending boss 6. The boss 5, supports a bushing 7, within which the operating shaft 3, is positioned. The bushing 7, is securely attached to a plate 8, preferably of suitable metal. The plate 8, is provided with an arcuate slot 9, see Figure 2, and an arcuate shaped strip 10, preferably of metal. is attachedto the plate 8, by any satisfactory means, as by rivets 11. The inner edge of thestrip 10, is substantially flush with the outer edge of the arcuate slot 9.

When the member 4, is made of insulating material I prefer to use a metal bushing 12 therein, to receive a stub shaft 13. The inner end of the shaft 13 is provided with a specially shaped head let, the outer surface of which is somewhat conical in shape and the edge of the head 14, is adapted to be positioned between the edge of the strip 10,

to the shaft 13, by set screw 15, which is operated through a hole 17, in the rim of 15. The member 4 is provided with an opening in or over which is positioned an escutcheon plate 18, that has an opening 19, through which the calibrated scale, having a suitable number of divisions, for example, 0 to 100, can be seen. The cscutcheon plate 18 also has additional openings 20 and 21, through which the stations may be read as the plate 8 is turned, it being understood that the station letters or numbers and the said scale divisions are placed on plate 8. Vhile the outer surface of the member 4, may be smooth. yet I prefer to break this up and as indicated in Figure 1, the surface is broken up by a series of ribs 22, which are slightly raised about the face of the member 4. Likewise the surface 23, may be provided with serra- Figure 1.

' The member 4, is also provided an -edge of the resilient member 10, and the index 25, that is adapted to cooperate with division marks 26 on the knob 15. It is to be understood from Figure 3, tha

the plate 8 is attached to the bushing 7, and

-to the shaft 3 by means of a set screw 27,

operated through the hole 17.- When the knob 15 isv being turned to the proper position, the member 4 is prevented from turn ing by means of a screw stud 28, attached to the panel 1, and being positioned in the boss 6,

The stud 28, also acts as a stop for engaging the extreme end 29, of the arcuate slot 9, when the dial is moved to the extreme posion, as shown in Figure 2.

In operation, on turning the knob 15, the shaft 13, is actuated through the frictional contact of the head 14, engaging between the edge of the plate 8, the plate 8' is .caused to rotate, thereby turning the shaft 3, with it, and the rotatable member connected to the shaft 3,

By this arrangement, I secure considerable reduction of motion between the knob 15, and the plate8, preferably a ratio of about 9 to 1, that is to say, in turning the knob 15,

- so that whilethe plate 8, moves one scale division number 30, the knob travels from marks 26 to 31, see Figure 1, the distance between the marks 26 and 31, may be divided into any suitable number of divisions such as tenths, so that the operatingshaft 3, may be regulated with extreme nicety. The amount of reduction of motion is, of course, dependent on the amount of over-lap of the member 10, with respect to the head 14, of the stub shaft end, and consequentl it will be obvious that the member 10, may e attached to the plate 8, in an adjustable manner for the purpose of changing the reduction of motion as desired. This is indicated in Figure 4, wherein the holes 11 are shownelongated, allowing the member 10 to be moved laterally, to securethe necessary overlap of the member 10 with respect to the head 14;. When for instance, the arrangement as shown in Figure 4-, is used,'it is to be understood that screws are used through the holes 11 in place of rivets, so the adjustment previously described may be readily made.

From what has been said it will-be observed that I have obtaineda reduction in I motion between the plate 8 and the knob '15,

and spring member and adapted to impart a rotary motionthereto, and means for changing the point of contact, of the driving member with at least the said spring member whereby the effective ratio between said driv-' ing member and driven member is varied.

2. A radio apparatus comprising ;a driven member embodying therein a rotary friction disc carrying indicia and a friction spring member fastened to said disc, a driving member engaging the adjacent faces of said disc and spring member and adapted to impart a rotary motion thereto, and means for shifting the spring member laterally with respect to the disc whereby the point of contact of the driving member with .at least the spring member is changed, so the efi'ective ratio between said driving and driven member is varied.

3. Adjusting means for an indicating dial comprising; a plate acting as the dial, said plate having an arcuately shaped slot therein, an arcuately shaped strip fastened to said plate adjacent one edge of the arcuate slot, so its edge may be forced away an appreciable amount from the plate, a stub shaft suitably supported entirely on the plate and having a head adapted to fit between the plate and said strip, means for adjusting the position of said strip for the purpose described, and an op-v erating member attached to said stub shaft.

4. A dial mechanism for a radio set comprising a unit assembly member, having an opening in the face thereof, and adapted to be non-rotatably positioned on a support, an indicating plate positioned within the periphcry of said assembly member and carrying indicia visible through the opening in said assembly member, said plate having means for attachment to a tuning apparatus associated with said support, a stub shaft carried by said assembly member, an operating member attached to the stub shaft on the face of the assembly member and concealing said tuning.- attaching'means and an operating connection between the end of said stub shaft and said plate, and including a member adj ustably carried on the plate, so that one edge may be given a desired amount of over-lap on the end of said stub shaft, and acting continuously to secure frictional engagement between the stub shaft and said plate. 

